65 |
|
double pdot; /* perturbed dot product */ |
66 |
|
} NORMDAT; /* normal material data */ |
67 |
|
|
68 |
< |
static srcdirf_t dirnorm; |
69 |
< |
static void gaussamp(RAY *r, NORMDAT *np); |
68 |
> |
static void gaussamp(NORMDAT *np); |
69 |
|
|
70 |
|
|
71 |
|
static void |
72 |
|
dirnorm( /* compute source contribution */ |
73 |
|
COLOR cval, /* returned coefficient */ |
74 |
< |
void *nnp, /* material data */ |
74 |
> |
void *nnp, /* material data */ |
75 |
|
FVECT ldir, /* light source direction */ |
76 |
|
double omega /* light source size */ |
77 |
|
) |
78 |
|
{ |
79 |
< |
register NORMDAT *np = nnp; |
79 |
> |
NORMDAT *np = nnp; |
80 |
|
double ldot; |
81 |
|
double lrdiff, ltdiff; |
82 |
|
double dtmp, d2, d3, d4; |
122 |
|
if (np->specfl & SP_FLAT) |
123 |
|
dtmp += omega * (0.25/PI); |
124 |
|
/* half vector */ |
125 |
< |
vtmp[0] = ldir[0] - np->rp->rdir[0]; |
127 |
< |
vtmp[1] = ldir[1] - np->rp->rdir[1]; |
128 |
< |
vtmp[2] = ldir[2] - np->rp->rdir[2]; |
125 |
> |
VSUB(vtmp, ldir, np->rp->rdir); |
126 |
|
d2 = DOT(vtmp, np->pnorm); |
127 |
|
d2 *= d2; |
128 |
|
d3 = DOT(vtmp,vtmp); |
166 |
|
} |
167 |
|
|
168 |
|
|
169 |
< |
extern int |
169 |
> |
int |
170 |
|
m_normal( /* color a ray that hit something normal */ |
171 |
< |
register OBJREC *m, |
172 |
< |
register RAY *r |
171 |
> |
OBJREC *m, |
172 |
> |
RAY *r |
173 |
|
) |
174 |
|
{ |
175 |
|
NORMDAT nd; |
179 |
|
int hastexture; |
180 |
|
double d; |
181 |
|
COLOR ctmp; |
182 |
< |
register int i; |
182 |
> |
int i; |
183 |
|
/* easy shadow test */ |
184 |
|
if (r->crtype & SHADOW && m->otype != MAT_TRANS) |
185 |
|
return(1); |
188 |
|
objerror(m, USER, "bad number of arguments"); |
189 |
|
/* check for back side */ |
190 |
|
if (r->rod < 0.0) { |
191 |
< |
if (!backvis && m->otype != MAT_TRANS) { |
191 |
> |
if (!backvis) { |
192 |
|
raytrans(r); |
193 |
|
return(1); |
194 |
|
} |
224 |
|
nd.rspec = m->oargs.farg[3]; |
225 |
|
/* compute Fresnel approx. */ |
226 |
|
if (nd.specfl & SP_PURE && nd.rspec >= FRESTHRESH) { |
227 |
< |
fest = FRESNE(r->rod); |
227 |
> |
fest = FRESNE(nd.pdot); |
228 |
|
nd.rspec += fest*(1. - nd.rspec); |
229 |
|
} else |
230 |
|
fest = 0.; |
280 |
|
if (m->otype != MAT_METAL) { |
281 |
|
setcolor(nd.scolor, nd.rspec, nd.rspec, nd.rspec); |
282 |
|
} else if (fest > FTINY) { |
283 |
< |
d = nd.rspec*(1. - fest); |
283 |
> |
d = m->oargs.farg[3]*(1. - fest); |
284 |
|
for (i = 0; i < 3; i++) |
285 |
< |
nd.scolor[i] = fest + nd.mcolor[i]*d; |
285 |
> |
colval(nd.scolor,i) = fest + |
286 |
> |
colval(nd.mcolor,i)*d; |
287 |
|
} else { |
288 |
|
copycolor(nd.scolor, nd.mcolor); |
289 |
|
scalecolor(nd.scolor, nd.rspec); |
319 |
|
return(1); /* 100% pure specular */ |
320 |
|
|
321 |
|
if (!(nd.specfl & SP_PURE)) |
322 |
< |
gaussamp(r, &nd); /* checks *BLT flags */ |
322 |
> |
gaussamp(&nd); /* checks *BLT flags */ |
323 |
|
|
324 |
|
if (nd.rdiff > FTINY) { /* ambient from this side */ |
325 |
|
copycolor(ctmp, nd.mcolor); /* modified by material color */ |
326 |
< |
if (nd.specfl & SP_RBLT) |
327 |
< |
scalecolor(ctmp, 1.0-nd.trans); |
328 |
< |
else |
331 |
< |
scalecolor(ctmp, nd.rdiff); |
326 |
> |
scalecolor(ctmp, nd.rdiff); |
327 |
> |
if (nd.specfl & SP_RBLT) /* add in specular as well? */ |
328 |
> |
addcolor(ctmp, nd.scolor); |
329 |
|
multambient(ctmp, r, hastexture ? nd.pnorm : r->ron); |
330 |
|
addcolor(r->rcol, ctmp); /* add to returned color */ |
331 |
|
} |
362 |
|
|
363 |
|
static void |
364 |
|
gaussamp( /* sample Gaussian specular */ |
365 |
< |
RAY *r, |
369 |
< |
register NORMDAT *np |
365 |
> |
NORMDAT *np |
366 |
|
) |
367 |
|
{ |
368 |
|
RAY sr; |
369 |
|
FVECT u, v, h; |
370 |
|
double rv[2]; |
371 |
|
double d, sinp, cosp; |
372 |
< |
COLOR scol; |
373 |
< |
int niter, ns2go; |
374 |
< |
register int i; |
372 |
> |
COLOR scol; |
373 |
> |
int maxiter, ntrials, nstarget, nstaken; |
374 |
> |
int i; |
375 |
|
/* quick test */ |
376 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) != SP_REFL && |
377 |
|
(np->specfl & (SP_TRAN|SP_TBLT)) != SP_TRAN) |
387 |
|
fcross(v, np->pnorm, u); |
388 |
|
/* compute reflection */ |
389 |
|
if ((np->specfl & (SP_REFL|SP_RBLT)) == SP_REFL && |
390 |
< |
rayorigin(&sr, SPECULAR, r, np->scolor) == 0) { |
391 |
< |
copycolor(scol, np->scolor); |
396 |
< |
ns2go = 1; |
390 |
> |
rayorigin(&sr, SPECULAR, np->rp, np->scolor) == 0) { |
391 |
> |
nstarget = 1; |
392 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
393 |
< |
ns2go = specjitter*sr.rweight + .5; |
394 |
< |
if (sr.rweight <= minweight*ns2go) |
395 |
< |
ns2go = sr.rweight/minweight; |
396 |
< |
if (ns2go > 1) { |
397 |
< |
d = 1./ns2go; |
398 |
< |
scalecolor(scol, d); |
393 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
394 |
> |
if (sr.rweight <= minweight*nstarget) |
395 |
> |
nstarget = sr.rweight/minweight; |
396 |
> |
if (nstarget > 1) { |
397 |
> |
d = 1./nstarget; |
398 |
> |
scalecolor(sr.rcoef, d); |
399 |
|
sr.rweight *= d; |
400 |
|
} else |
401 |
< |
ns2go = 1; |
401 |
> |
nstarget = 1; |
402 |
|
} |
403 |
< |
dimlist[ndims++] = (int)np->mp; |
404 |
< |
for (niter = ns2go*MAXITER; (ns2go > 0) & (niter > 0); niter--) { |
405 |
< |
if (specjitter > 1.5) |
403 |
> |
setcolor(scol, 0., 0., 0.); |
404 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
405 |
> |
maxiter = MAXITER*nstarget; |
406 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
407 |
> |
ntrials < maxiter; ntrials++) { |
408 |
> |
if (ntrials) |
409 |
|
d = frandom(); |
410 |
|
else |
411 |
|
d = urand(ilhash(dimlist,ndims)+samplendx); |
421 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
422 |
|
for (i = 0; i < 3; i++) |
423 |
|
h[i] = np->pnorm[i] + d*(cosp*u[i] + sinp*v[i]); |
424 |
< |
d = -2.0 * DOT(h, r->rdir) / (1.0 + d*d); |
425 |
< |
if (d <= np->pdot + FTINY) |
424 |
> |
d = -2.0 * DOT(h, np->rp->rdir) / (1.0 + d*d); |
425 |
> |
VSUM(sr.rdir, np->rp->rdir, h, d); |
426 |
> |
/* sample rejection test */ |
427 |
> |
if ((d = DOT(sr.rdir, np->rp->ron)) <= FTINY) |
428 |
|
continue; |
429 |
– |
VSUM(sr.rdir, r->rdir, h, d); |
430 |
– |
if (DOT(sr.rdir, r->ron) <= FTINY) |
431 |
– |
continue; |
429 |
|
checknorm(sr.rdir); |
430 |
< |
if (specjitter > 1.5) { /* adjusted W-G-M-D weight */ |
431 |
< |
d = 2.*(1. - np->pdot/d); |
432 |
< |
copycolor(sr.rcoef, scol); |
433 |
< |
scalecolor(sr.rcoef, d); |
434 |
< |
rayclear(&sr); |
430 |
> |
if (nstarget > 1) { /* W-G-M-D adjustment */ |
431 |
> |
if (nstaken) rayclear(&sr); |
432 |
> |
rayvalue(&sr); |
433 |
> |
d = 2./(1. + np->rp->rod/d); |
434 |
> |
scalecolor(sr.rcol, d); |
435 |
> |
addcolor(scol, sr.rcol); |
436 |
> |
} else { |
437 |
> |
rayvalue(&sr); |
438 |
> |
multcolor(sr.rcol, sr.rcoef); |
439 |
> |
addcolor(np->rp->rcol, sr.rcol); |
440 |
|
} |
441 |
< |
rayvalue(&sr); |
440 |
< |
multcolor(sr.rcol, sr.rcoef); |
441 |
< |
addcolor(r->rcol, sr.rcol); |
442 |
< |
--ns2go; |
441 |
> |
++nstaken; |
442 |
|
} |
443 |
+ |
if (nstarget > 1) { /* final W-G-M-D weighting */ |
444 |
+ |
multcolor(scol, sr.rcoef); |
445 |
+ |
d = (double)nstarget/ntrials; |
446 |
+ |
scalecolor(scol, d); |
447 |
+ |
addcolor(np->rp->rcol, scol); |
448 |
+ |
} |
449 |
|
ndims--; |
450 |
|
} |
451 |
|
/* compute transmission */ |
452 |
|
copycolor(sr.rcoef, np->mcolor); /* modified by color */ |
453 |
|
scalecolor(sr.rcoef, np->tspec); |
454 |
|
if ((np->specfl & (SP_TRAN|SP_TBLT)) == SP_TRAN && |
455 |
< |
rayorigin(&sr, SPECULAR, r, sr.rcoef) == 0) { |
456 |
< |
ns2go = 1; |
455 |
> |
rayorigin(&sr, SPECULAR, np->rp, sr.rcoef) == 0) { |
456 |
> |
nstarget = 1; |
457 |
|
if (specjitter > 1.5) { /* multiple samples? */ |
458 |
< |
ns2go = specjitter*sr.rweight + .5; |
459 |
< |
if (sr.rweight <= minweight*ns2go) |
460 |
< |
ns2go = sr.rweight/minweight; |
461 |
< |
if (ns2go > 1) { |
462 |
< |
d = 1./ns2go; |
458 |
> |
nstarget = specjitter*np->rp->rweight + .5; |
459 |
> |
if (sr.rweight <= minweight*nstarget) |
460 |
> |
nstarget = sr.rweight/minweight; |
461 |
> |
if (nstarget > 1) { |
462 |
> |
d = 1./nstarget; |
463 |
|
scalecolor(sr.rcoef, d); |
464 |
|
sr.rweight *= d; |
465 |
|
} else |
466 |
< |
ns2go = 1; |
466 |
> |
nstarget = 1; |
467 |
|
} |
468 |
< |
dimlist[ndims++] = (int)np->mp; |
469 |
< |
for (niter = ns2go*MAXITER; (ns2go > 0) & (niter > 0); niter--) { |
470 |
< |
if (specjitter > 1.5) |
468 |
> |
dimlist[ndims++] = (int)(size_t)np->mp; |
469 |
> |
maxiter = MAXITER*nstarget; |
470 |
> |
for (nstaken = ntrials = 0; nstaken < nstarget && |
471 |
> |
ntrials < maxiter; ntrials++) { |
472 |
> |
if (ntrials) |
473 |
|
d = frandom(); |
474 |
|
else |
475 |
< |
d = urand(ilhash(dimlist,ndims)+1823+samplendx); |
475 |
> |
d = urand(ilhash(dimlist,ndims)+samplendx); |
476 |
|
multisamp(rv, 2, d); |
477 |
|
d = 2.0*PI * rv[0]; |
478 |
|
cosp = tcos(d); |
485 |
|
d = sqrt( np->alpha2 * -log(rv[1]) ); |
486 |
|
for (i = 0; i < 3; i++) |
487 |
|
sr.rdir[i] = np->prdir[i] + d*(cosp*u[i] + sinp*v[i]); |
488 |
< |
if (DOT(sr.rdir, r->ron) >= -FTINY) |
488 |
> |
/* sample rejection test */ |
489 |
> |
if (DOT(sr.rdir, np->rp->ron) >= -FTINY) |
490 |
|
continue; |
491 |
|
normalize(sr.rdir); /* OK, normalize */ |
492 |
< |
if (specjitter > 1.5) /* multi-sampling */ |
492 |
> |
if (nstaken) /* multi-sampling */ |
493 |
|
rayclear(&sr); |
494 |
|
rayvalue(&sr); |
495 |
|
multcolor(sr.rcol, sr.rcoef); |
496 |
< |
addcolor(r->rcol, sr.rcol); |
497 |
< |
--ns2go; |
496 |
> |
addcolor(np->rp->rcol, sr.rcol); |
497 |
> |
++nstaken; |
498 |
|
} |
499 |
|
ndims--; |
500 |
|
} |